import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    cartItems: [
      { id: 1, name: '手机', price: 1000, quantity: 1 },
      { id: 2, name: '电脑', price: 2000, quantity: 1 },
      { id: 3, name: '键盘', price: 200, quantity: 2 }
    ]
  },
  getters: {
    cartTotalPrice(state) {
      return state.cartItems.reduce((total, item) => total + item.price * item.quantity, 0);
    }
  },
  mutations: {
    incrementQuantity(state, id) {
      const item = state.cartItems.find(item => item.id === id);
      if (item) {
        item.quantity++;
      }
    },
    decrementQuantity(state, id) {
      const item = state.cartItems.find(item => item.id === id);
      if (item && item.quantity > 0) {
        item.quantity--;
      }
    }
  },
  actions: {
    increment({ commit }, id) {
      commit('incrementQuantity', id);
    },
    decrement({ commit }, id) {
      commit('decrementQuantity', id);
    }
  }
})
